package com.boot01.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 登录拦截器
 */
public class LoginInterceptor implements HandlerInterceptor {

    /**
     * return true:放行 false:不放行
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object username = request.getSession().getAttribute("username");
        if(username == null){
            // 没有登录,进行转发
            request.setAttribute("msg","没有访问权限，请先登录");
            request.getRequestDispatcher("index.html").forward(request,response);
            return false;
        }
        return true;
    }
}
